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import os
import leafmap
import solara
import ipywidgets as widgets
import pandas as pd
import geopandas as gpd
import tempfile
from shapely.geometry import Point
event = "HurricaneMilton-Oct24"
url = "https://raw.githubusercontent.com/opengeos/maxar-open-data/master"
repo = "https://github.com/opengeos/maxar-open-data/blob/master/datasets"
def get_datasets():
datasets = f"{url}/datasets.csv"
df = pd.read_csv(datasets)
return df
def get_catalogs(name):
dataset = f"{url}/datasets/{name}.tsv"
basename = os.path.basename(dataset)
tempdir = tempfile.gettempdir()
tmp_dataset = os.path.join(tempdir, basename)
if os.path.exists(tmp_dataset):
dataset_df = pd.read_csv(tmp_dataset, sep="\t")
else:
dataset_df = pd.read_csv(dataset, sep="\t")
dataset_df.to_csv(tmp_dataset, sep="\t", index=False)
catalog_ids = dataset_df["catalog_id"].unique().tolist()
catalog_ids.sort()
return catalog_ids
def get_image_date(catalog_id, m):
gdf = m.footprint
image_date = pd.Timestamp(
gdf[gdf["catalog_id"] == catalog_id]["datetime"].values[0]
).strftime("%Y-%m-%d %H:%M:%S")
return image_date
def add_widgets(m):
datasets = get_datasets()["dataset"].tolist()
setattr(m, "zoom_to_layer", True)
style = {"description_width": "initial"}
padding = "0px 0px 0px 5px"
dataset = widgets.Dropdown(
options=datasets,
description="Event:",
value=event,
style=style,
layout=widgets.Layout(width="270px", padding=padding),
)
catalog_ids = get_catalogs(dataset.value)
setattr(m, "catalog_ids", catalog_ids)
date_picker = widgets.DatePicker(
description="Start date:",
value=pd.to_datetime("2021-01-01").date(),
style=style,
layout=widgets.Layout(width="270px", padding=padding),
)
image = widgets.Dropdown(
value=None,
options=m.catalog_ids,
description="Image:",
style=style,
layout=widgets.Layout(width="270px", padding=padding),
)
checkbox = widgets.Checkbox(
value=True,
description="Footprints",
style=style,
layout=widgets.Layout(width="90px", padding="0px"),
)
split = widgets.Checkbox(
value=False,
description="Split map",
style=style,
layout=widgets.Layout(width="92px", padding=padding),
)
reset = widgets.Checkbox(
value=False,
description="Reset",
style=style,
layout=widgets.Layout(width="75px", padding="0px"),
)
output = widgets.Output()
def reset_map(change):
if change.new:
image.value = None
image.options = m.catalog_ids
m.layers = m.layers[:3]
m.zoom_to_layer = True
reset.value = False
date_picker.value = pd.to_datetime("2021-01-01").date()
m.remove_layer(m.find_layer("Footprint"))
m.add_gdf(
m.footprint,
layer_name="Footprint",
zoom_to_layer=False,
info_mode="on_hover",
)
satellite_layer = m.find_layer("Google Satellite")
satellite_layer.visible = False
output.outputs = ()
reset.observe(reset_map, names="value")
def change_dataset(change):
default_geojson = f"{url}/datasets/{change.new}_union.geojson"
m.layers = m.layers[:2]
basename = os.path.basename(default_geojson)
tempdir = tempfile.gettempdir()
tmp_geojson = os.path.join(tempdir, basename)
if os.path.exists(tmp_geojson):
default_geojson = tmp_geojson
else:
leafmap.download_file(default_geojson, tmp_geojson, quiet=True)
m.add_geojson(default_geojson, layer_name="Footprint", zoom_to_layer=True)
setattr(m, "gdf", gpd.read_file(default_geojson))
image.options = get_catalogs(change.new)
dataset.observe(change_dataset, names="value")
def change_date(change):
if change.new:
start_date = change.new.strftime("%Y-%m-%d")
sub_gdf = m.gdf[m.gdf["datetime"] >= start_date]
sub_catalog_ids = sub_gdf["catalog_id"].values.tolist()
image.options = sub_catalog_ids
m.remove_layer(m.find_layer("Footprint"))
m.add_gdf(
sub_gdf,
layer_name="Footprint",
zoom_to_layer=False,
info_mode="on_hover",
)
m.gdf = sub_gdf
date_picker.observe(change_date, names="value")
def change_image(change):
if change.new:
if change.new not in m.get_layer_names():
mosaic = f"{url}/datasets/{dataset.value}/{image.value}.json"
print(mosaic)
m.add_stac_layer(mosaic, name=image.value, fit_bounds=m.zoom_to_layer)
image_date = get_image_date(image.value, m)
output.outputs = ()
output.append_stdout(f"Image date: {image_date}\n")
image.observe(change_image, names="value")
def change_footprint(change):
geojson_layer = m.find_layer("Footprint")
if change.new:
geojson_layer.visible = True
else:
geojson_layer.visible = False
checkbox.observe(change_footprint, names="value")
def change_split(change):
if change.new:
if image.value is not None:
left_layer = m.find_layer(image.value)
right_layer = m.find_layer("Google Satellite")
right_layer.visible = True
footprint_layer = m.find_layer("Footprint")
footprint_layer.visible = False
checkbox.value = False
m.split_map(
left_layer=left_layer,
right_layer=right_layer,
add_close_button=True,
left_label=image.value,
right_label="Google Satellite",
)
split.value = False
else:
left_layer = None
split.observe(change_split, names="value")
def handle_click(**kwargs):
if kwargs.get("type") == "click":
latlon = kwargs.get("coordinates")
geometry = Point(latlon[::-1])
selected = m.gdf[m.gdf.intersects(geometry)]
setattr(m, "zoom_to_layer", False)
if len(selected) > 0:
catalog_ids = selected["catalog_id"].values.tolist()
image.value = None
if len(catalog_ids) > 1:
image.options = catalog_ids
image.value = catalog_ids[0]
else:
image.value = None
m.on_interaction(handle_click)
box = widgets.VBox(
[dataset, date_picker, image, widgets.HBox([checkbox, split, reset]), output]
)
m.add_widget(box, position="topright", add_header=False)
zoom = solara.reactive(2)
center = solara.reactive((20, 0))
class Map(leafmap.Map):
def __init__(self, **kwargs):
kwargs["toolbar_control"] = False
super().__init__(**kwargs)
basemap = {
"url": "https://mt1.google.com/vt/lyrs=s&x={x}&y={y}&z={z}",
"attribution": "Google",
"name": "Google Satellite",
}
self.add_tile_layer(**basemap, shown=False)
self.add_layer_manager(opened=False)
add_widgets(self)
default_geojson = f"{url}/datasets/{event}_union.geojson"
basename = os.path.basename(default_geojson)
tempdir = tempfile.gettempdir()
tmp_geojson = os.path.join(tempdir, basename)
if os.path.exists(tmp_geojson):
default_geojson = tmp_geojson
else:
leafmap.download_file(default_geojson, tmp_geojson, quiet=True)
self.add_geojson(
default_geojson,
layer_name="Footprint",
zoom_to_layer=True,
info_mode="on_hover",
)
gdf = gpd.read_file(default_geojson)
setattr(self, "gdf", gdf)
setattr(self, "footprint", gdf)
@solara.component
def Page():
with solara.Column(style={"min-width": "500px"}):
# solara components support reactive variables
# solara.SliderInt(label="Zoom level", value=zoom, min=1, max=20)
# using 3rd party widget library require wiring up the events manually
# using zoom.value and zoom.set
Map.element( # type: ignore
zoom=zoom.value,
on_zoom=zoom.set,
center=center.value,
on_center=center.set,
scroll_wheel_zoom=True,
toolbar_ctrl=False,
data_ctrl=False,
height="780px",
)
solara.Text(f"Center: {center.value}")
solara.Text(f"Zoom: {zoom.value}")
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